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Given the diversity of phenomena that occur during operation of automotive powertrain and their strong impact on the environment, this paper presents a unified approach to these problems. This is a complex pattern study, composed of a mathematical model, a simulation done by inserting subroutines in the software package MATLAB 6.5 and a CATIA V5R16 environment modeling. By customizing the model obtained can define it completely stabilized operating modes of propulsion systems and their dynamic, economic and pollution parameters. This provides, even the design phase, definition of additional constructive and functional criteria against the current, to ensure stable and economic operation, in an area as extensive.